The polar vortex is Earth's frozen guardian—but that guardian is starting to fail. This video dives into the science behind ...

While global temperatures are rising, climate change is paradoxically causing harsher and colder winters in many regions.

In the atmospheric layer above it, about 10 to 30 miles up, is the stratospheric polar vortex, where every winter a sunlight-starved Arctic spins up a mass of cold air that, ultimately, dissipates ...